Travis S. Schmidt
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View article: Imidacloprid in United States Rivers, 2013–2022: Persistent Presence and Emerging Chronic Hazard
Imidacloprid in United States Rivers, 2013–2022: Persistent Presence and Emerging Chronic Hazard Open
Imidacloprid, a neonicotinoid insecticide, is used for agricultural and nonagricultural purposes and is toxic to nontarget organisms at low concentrations in aquatic ecosystems. A total of 12,547 water samples were collected from 2013 to 2…
View article: Non‐native prey availability and over‐compensatory density dependence drive population dynamics of a native fish predator
Non‐native prey availability and over‐compensatory density dependence drive population dynamics of a native fish predator Open
Understanding the factors that regulate population dynamics is crucial for conserving imperiled species. Bull trout ( Salvelinus confluentus ), a piscivorous salmonid and one of North America's most threatened cold‐water species, has decli…
View article: Integrating the Bright and Dark Sides of Aquatic Resource Subsidies—A Synthesis
Integrating the Bright and Dark Sides of Aquatic Resource Subsidies—A Synthesis Open
Aquatic and terrestrial ecosystems are linked through the reciprocal exchange of materials and organisms. Aquatic‐to‐terrestrial subsidies are relatively small in most terrestrial ecosystems, but they can provide high contents of limiting …
View article: Evidence of Long-Range Transport of Selenium Downstream of Coal Mining Operations in the Elk River Valley, Canada
Evidence of Long-Range Transport of Selenium Downstream of Coal Mining Operations in the Elk River Valley, Canada Open
Expanding coal-mining operations in the Elk River Valley (British Columbia, Canada) have increased total selenium (Se) concentrations in the transboundary Lake Koocanusa (Canada and United States), but the spatial extent of Se transport fr…
View article: Improving ecosystem health in highly altered river basins: a generalized framework and its application to the Mississippi-Atchafalaya River Basin
Improving ecosystem health in highly altered river basins: a generalized framework and its application to the Mississippi-Atchafalaya River Basin Open
Continued large-scale public investment in declining ecosystems depends on demonstrations of “success”. While the public conception of “success” often focuses on restoration to a pre-disturbance condition, the scientific community is more …
View article: Multiple lines of evidence point to pesticides as stressors affecting invertebrate communities in small streams in five United States regions
Multiple lines of evidence point to pesticides as stressors affecting invertebrate communities in small streams in five United States regions Open
Multistressor studies were performed in five regions of the United States to assess the role of pesticides as stressors affecting invertebrate communities in wadable streams. Pesticides and other chemical and physical stressors were measur…
View article: Growth of Coal Mining Operations in the Elk River Valley (Canada) Linked to Increasing Solute Transport of Se, NO<sub>3</sub><sup>–</sup>, and SO<sub>4</sub><sup>2–</sup> into the Transboundary Koocanusa Reservoir (USA–Canada)
Growth of Coal Mining Operations in the Elk River Valley (Canada) Linked to Increasing Solute Transport of Se, NO<sub>3</sub><sup>–</sup>, and SO<sub>4</sub><sup>2–</sup> into the Transboundary Koocanusa Reservoir (USA–Canada) Open
Koocanusa Reservoir (KOC) is a waterbody that spans the United States (U.S.) and Canadian border. Increasing concentrations of total selenium (Se), nitrate + nitrite (NO3-, nitrite is insignificant or not present), and sulfate (SO42-) in K…
View article: Density declines, richness increases, and composition shifts in stream macroinvertebrates
Density declines, richness increases, and composition shifts in stream macroinvertebrates Open
Documenting trends of stream macroinvertebrate biodiversity is challenging because biomonitoring often has limited spatial, temporal, and taxonomic scopes. We analyzed biodiversity and composition of assemblages of >500 genera, spanning 27…
View article: Ecological consequences of neonicotinoid mixtures in streams
Ecological consequences of neonicotinoid mixtures in streams Open
Neonicotinoid mixtures are common in streams worldwide, but corresponding ecological responses are poorly understood. We combined experimental and observational studies to narrow this knowledge gap. The mesocosm experiment determined that …
View article: Temporal Influences on Selenium Partitioning, Trophic Transfer, and Exposure in a Major U.S. River
Temporal Influences on Selenium Partitioning, Trophic Transfer, and Exposure in a Major U.S. River Open
Hydrologic and irrigation regimes mediate the timing of selenium (Se) mobilization to rivers, but the extent to which patterns in Se uptake and trophic transfer through recipient food webs reflect the temporal variation in Se delivery is u…
View article: Common insecticide disrupts aquatic communities: A mesocosm-to-field ecological risk assessment of fipronil and its degradates in U.S. streams
Common insecticide disrupts aquatic communities: A mesocosm-to-field ecological risk assessment of fipronil and its degradates in U.S. streams Open
Study shows that a common insecticide frequently detected in U.S. streams is more toxic than previously thought.
View article: Time-dependent accumulation of Cd, Co, Cu, Ni, and Zn in natural communities of mayfly and caddisfly larvae: Metal sensitivity, uptake pathways, and mixture toxicity
Time-dependent accumulation of Cd, Co, Cu, Ni, and Zn in natural communities of mayfly and caddisfly larvae: Metal sensitivity, uptake pathways, and mixture toxicity Open
Conceptual and quantitative models were developed to assess time-dependent processes in four sequential experimental stream studies that determined abundances of natural communities of mayfly and caddisfly larvae dosed with single metals (…
View article: Mercury and selenium concentrations in fishes of the Upper Colorado River Basin, southwestern United States: A retrospective assessment
Mercury and selenium concentrations in fishes of the Upper Colorado River Basin, southwestern United States: A retrospective assessment Open
Mercury (Hg) and selenium (Se) are contaminants of concern for fish in the Upper Colorado River Basin (UCRB). We explored Hg and Se in fish tissues (2,324 individuals) collected over 50 years (1962-2011) from the UCRB. Samples include nati…
View article: Bioaccumulation and Toxicity of Cadmium, Copper, Nickel, and Zinc and Their Mixtures to Aquatic Insect Communities
Bioaccumulation and Toxicity of Cadmium, Copper, Nickel, and Zinc and Their Mixtures to Aquatic Insect Communities Open
We describe 2 artificial stream experiments that exposed aquatic insect communities to zinc (Zn), copper (Cu), and cadmium (year 2014) and to Zn, Cu, and nickel (year 2015). The testing strategy was to concurrently expose insect communitie…
View article: Projected urban growth in the southeastern USA puts small streams at risk
Projected urban growth in the southeastern USA puts small streams at risk Open
Future land-use development has the potential to profoundly affect the health of aquatic ecosystems in the coming decades. We developed regression models predicting the loss of sensitive fish (R2 = 0.39) and macroinvertebrate (R2 = 0.64) t…
View article: Benthic Algal (Periphyton) Growth Rates in Response to Nitrogen and Phosphorus: Parameter Estimation for Water Quality Models
Benthic Algal (Periphyton) Growth Rates in Response to Nitrogen and Phosphorus: Parameter Estimation for Water Quality Models Open
Nitrogen (N) and phosphorus (P) are significant pollutants that can stimulate nuisance blooms of algae. Water quality models (e.g., Water Quality Simulation Program, CE‐QUAL‐R1, CE‐QUAL‐ICM, QUAL2k) are valuable and widely used management …
View article: Supporting information: Bioaccumulation and toxicity of cadmium, copper, nickel, zinc, and their mixtures to aquatic insect communities
Supporting information: Bioaccumulation and toxicity of cadmium, copper, nickel, zinc, and their mixtures to aquatic insect communities Open
These datasets provide supporting information for the article by the same title, published in the journal Environmental Toxicology and Chemistry, which gives the context for the present information. The study consisted of two artificial st…
View article: Linking the Agricultural Landscape of the Midwest to Stream Health with Structural Equation Modeling
Linking the Agricultural Landscape of the Midwest to Stream Health with Structural Equation Modeling Open
Multiple physical and chemical stressors can simultaneously affect the biological condition of streams. To better understand the complex interactions of land-use practices, water quality, and ecological integrity of streams, the U.S. Geolo…
View article: Dataset for: UNDERSTANDING THE CAPTIVITY EFFECT ON INVERTEBRATE COMMUNITIES TRANSPLANTED INTO AN EXPERIMENTAL STREAM LABORATORY
Dataset for: UNDERSTANDING THE CAPTIVITY EFFECT ON INVERTEBRATE COMMUNITIES TRANSPLANTED INTO AN EXPERIMENTAL STREAM LABORATORY Open
Little is known about how design and testing methodologies affect the macroinvertebrate communities that are held captive in mesocosms. To address this gap, we conducted a 32-day test to determine how seeded invertebrate communities change…
View article: Thermal regimes of Rocky Mountain lakes warm with climate change
Thermal regimes of Rocky Mountain lakes warm with climate change Open
Anthropogenic climate change is causing a wide range of stresses in aquatic ecosystems, primarily through warming thermal conditions. Lakes, in response to these changes, are experiencing increases in both summer temperatures and ice-free …
View article: Zinc concentrations and isotopic signatures of an aquatic insect (mayfly, Baetis tricaudatus)
Zinc concentrations and isotopic signatures of an aquatic insect (mayfly, Baetis tricaudatus) Open
Insect metamorphosis often results in substantial chemical changes that can fractionate isotopes and alter contaminant concentrations. We exposed larval mayflies (Baetis tricaudatus) to an aqueous zinc gradient (3-340 g Zn/l) and measured …
View article: Appendix A. Description of the study area, six related figures, and two tables containing all statistical results.
Appendix A. Description of the study area, six related figures, and two tables containing all statistical results. Open
Description of the study area, six related figures, and two tables containing all statistical results.